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#include <stdio.h>
int main()
{
const float PI = 3.141593;
float diameter;
float radius;
float circ;
float area;
printf("Enter the diameter of a circle in millimeters:");
scanf("%f", &diameter);
circ = PI * diameter;
radius = diameter / 2;
area = PI * (radius * radius);
printf("\n\tCircumference is %.2f mm" , circ);
printf("\n\tAnd the area is %.2f sq.mm\n" , area);
return 0;
}
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